Question: Imagine contracting the edge above each red node in a red - black tree, so that it shrinks to nothing, merging it with its parent.

Imagine contracting the edge above each red node in a red-black tree, so that it shrinks
to nothing, merging it with its parent. All other edges are maintained. What is the
most that this operation can change the height of the tree? What is the maximum
number of children of any node?

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